1 /*
2 * Copyright (C) 2015 Samsung Electronics
3 *
4 * Przemyslaw Marczak <p.marczak@samsung.com>
5 *
6 * SPDX-License-Identifier: GPL-2.0+
7 */
8
9 #include <common.h>
10 #include <errno.h>
11 #include <dm.h>
12 #include <i2c.h>
13 #include <asm/gpio.h>
14 #include <power/pmic.h>
15 #include <power/regulator.h>
16
17 DECLARE_GLOBAL_DATA_PTR;
18
19 struct fixed_regulator_platdata {
20 struct gpio_desc gpio; /* GPIO for regulator enable control */
21 unsigned int startup_delay_us;
22 };
23
fixed_regulator_ofdata_to_platdata(struct udevice * dev)24 static int fixed_regulator_ofdata_to_platdata(struct udevice *dev)
25 {
26 struct dm_regulator_uclass_platdata *uc_pdata;
27 struct fixed_regulator_platdata *dev_pdata;
28 struct gpio_desc *gpio;
29 int flags = GPIOD_IS_OUT;
30 int ret;
31
32 dev_pdata = dev_get_platdata(dev);
33 uc_pdata = dev_get_uclass_platdata(dev);
34 if (!uc_pdata)
35 return -ENXIO;
36
37 /* Set type to fixed */
38 uc_pdata->type = REGULATOR_TYPE_FIXED;
39 if (!dev_read_bool(dev, "enable-active-high"))
40 flags |= GPIOD_ACTIVE_LOW;
41 if (dev_read_bool(dev, "regulator-boot-on"))
42 flags |= GPIOD_IS_OUT_ACTIVE;
43
44 /* Get fixed regulator optional enable GPIO desc */
45 gpio = &dev_pdata->gpio;
46 ret = gpio_request_by_name(dev, "gpio", 0, gpio, flags);
47 if (ret) {
48 ret = gpio_request_by_name(dev, "gpios", 0, gpio, flags);
49 if (ret) {
50 debug("Fixed regulator optional enable GPIO - not found! Error: %d\n", ret);
51 if (ret != -ENOENT)
52 return ret;
53 }
54 }
55
56 /* Get optional ramp up delay */
57 dev_pdata->startup_delay_us = dev_read_u32_default(dev,
58 "startup-delay-us", 0);
59
60 return 0;
61 }
62
fixed_regulator_get_value(struct udevice * dev)63 static int fixed_regulator_get_value(struct udevice *dev)
64 {
65 struct dm_regulator_uclass_platdata *uc_pdata;
66
67 uc_pdata = dev_get_uclass_platdata(dev);
68 if (!uc_pdata)
69 return -ENXIO;
70
71 if (uc_pdata->min_uV != uc_pdata->max_uV) {
72 debug("Invalid constraints for: %s\n", uc_pdata->name);
73 return -EINVAL;
74 }
75
76 return uc_pdata->min_uV;
77 }
78
fixed_regulator_get_current(struct udevice * dev)79 static int fixed_regulator_get_current(struct udevice *dev)
80 {
81 struct dm_regulator_uclass_platdata *uc_pdata;
82
83 uc_pdata = dev_get_uclass_platdata(dev);
84 if (!uc_pdata)
85 return -ENXIO;
86
87 if (uc_pdata->min_uA != uc_pdata->max_uA) {
88 debug("Invalid constraints for: %s\n", uc_pdata->name);
89 return -EINVAL;
90 }
91
92 return uc_pdata->min_uA;
93 }
94
fixed_regulator_get_enable(struct udevice * dev)95 static int fixed_regulator_get_enable(struct udevice *dev)
96 {
97 struct fixed_regulator_platdata *dev_pdata = dev_get_platdata(dev);
98
99 /* Enable GPIO is optional */
100 if (!dev_pdata->gpio.dev)
101 return true;
102
103 return dm_gpio_get_value(&dev_pdata->gpio);
104 }
105
fixed_regulator_set_enable(struct udevice * dev,bool enable)106 static int fixed_regulator_set_enable(struct udevice *dev, bool enable)
107 {
108 struct fixed_regulator_platdata *dev_pdata = dev_get_platdata(dev);
109 int ret;
110
111 debug("%s: dev='%s', enable=%d, delay=%d, has_gpio=%d\n", __func__,
112 dev->name, enable, dev_pdata->startup_delay_us,
113 dm_gpio_is_valid(&dev_pdata->gpio));
114 /* Enable GPIO is optional */
115 if (!dm_gpio_is_valid(&dev_pdata->gpio)) {
116 if (!enable)
117 return -ENOSYS;
118 return 0;
119 }
120
121 ret = dm_gpio_set_value(&dev_pdata->gpio, enable);
122 if (ret) {
123 pr_err("Can't set regulator : %s gpio to: %d\n", dev->name,
124 enable);
125 return ret;
126 }
127
128 if (enable && dev_pdata->startup_delay_us)
129 udelay(dev_pdata->startup_delay_us);
130 debug("%s: done\n", __func__);
131
132 return 0;
133 }
134
135 static const struct dm_regulator_ops fixed_regulator_ops = {
136 .get_value = fixed_regulator_get_value,
137 .get_current = fixed_regulator_get_current,
138 .get_enable = fixed_regulator_get_enable,
139 .set_enable = fixed_regulator_set_enable,
140 };
141
142 static const struct udevice_id fixed_regulator_ids[] = {
143 { .compatible = "regulator-fixed" },
144 { },
145 };
146
147 U_BOOT_DRIVER(fixed_regulator) = {
148 .name = "fixed regulator",
149 .id = UCLASS_REGULATOR,
150 .ops = &fixed_regulator_ops,
151 .of_match = fixed_regulator_ids,
152 .ofdata_to_platdata = fixed_regulator_ofdata_to_platdata,
153 .platdata_auto_alloc_size = sizeof(struct fixed_regulator_platdata),
154 };
155